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However if u want to kill tankier enemies and build Last Whisper, then your ArPen effectiveness will be reduced by 50%.

Knowing this you will have to decide: will i focus only squishy champs? or all my enemies? Is my physical damage output enough in early/mid game so the ArPen are worth (all champs with an average of 50 armor)?

Generally you will use Penetration in your Marks, and your choice in Quints. Hp/5 and HP are also wonderful choices for Quints in many cases instead of offensive ones to make your laning phase go well. However if you looking at purely offensive choices, then I'd look to the above.

Most champions have around 15 armor at lvl 1, so 31 armor pen is overkill early game. I would use AD on champs that play aggressively during laning like Cait or Ezreal.

Actually, you'll do more damage than you would if the player has negative resistance. So if someone has -15 armor after resistance, you'll do about 10% more damage.
So in no way is it considered overkill.

However if u want to kill tankier enemies and build Last Whisper, then your ArPen effectiveness will be reduced by 50%.

That's a fallacy because when you buy last whisper you're still getting way more armpen than you would have had without it. Having flat armpen "decreases" the value of last whisper because you reduce the amount of armor it pierces but you are still piercing much more armor overall than if you didn't have last whisper. Not to mention that your claim of "50%" effectiveness" is completely made up.

It's important to note, that with armor penetration items, you cannot go into the negatives. That's why ArmPen Marks w/ AD Quints will tend to have superior auto attack damage at level one when you use a hero with 50 starting damage. Given a few levels, targets having armor runes, or higher starting damages the ArmPen Quints will end up being superior a lot quicker. A Last Whisper is useful as long as your target is stacking any armor items.